Hi, I have sunca battery attached in my emergency light , I usually charge it for 10-12 hours but it gets discharged in only 30-40 seconds , what may be the problem?

How long have you had the battery for? Was it discharged before you charged it up ?

Any chance the battery terminals got shorted brieflyor totally discharged for a period? Some rechargeable go dead forever if they have been allow to go totally dead

No both the terminals are soldered to their proper place.

No, both the terminals are soldered to their proper place

If u charged the after one year then obviously it can't charged but I will suggest u to take out the battery and give it the high voltage e.g. if battery is 12v then u have to give it 20 volts this is just like a shock given to the dead person to get him alive if the battery does not work then u have to replace it and also tell me that what kind of battery u have either it is dry battery or something else if u have a dry battery then u have to charged it after every at least one month for the future

Hey bally, is ibadullah is right?

Not that I have ever heard. You never mentioned which Sunca battery you have. Is it NiCad or what. The life of a rechargeable battery can be as little as 2 years depending on how it is used. Are you certain the battery never became 100% discharged, that can cause polarity to reverse and then you have to buy a new one.